The label has come off a cylinder of gas in your laboratory. You know only that

Question

The label has come off a cylinder of gas in your laboratory. You know only that one species of gas is contained in the c ylinder, but you do not know whether it is hydrogen, oxygen or nitrogen. To find out, you evacuate a 5-liter flask, seal it and weigh it, then let gas from the cylinder flow into it until the gauge pressure equals 2.00 atm. The flask is reweighed, and the mass of the added gas is found to be 17.1 g. Room temperature is 27 °C, and barometric pressure is 1.00 atm. What is the gas?

Explanation / Answer

PV = nRT

3 X 5 = mass X R X 300 / mol wt

15 = mass X .0820 X 300 / mol wt

therfore

molwt = 17.1 X 0.0820 X 300 / 15 = 28

Therfore the gas is Nitrogen

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